Definition of “aerobics” - English Dictionary

“aerobics” in British English

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aerobicsnoun [ U ]

uk /eəˈrəʊ.bɪks/ us /erˈoʊ.bɪks/

energetic physical exercises, often performed with a group of people to music, that make the heart, lungs, and muscles stronger and increase the amount of oxygen in the blood:

She does aerobics.
I go to aerobics (= to a class where we are taught such exercises) once a week.
an aerobics instructor/teacher
aerobic
adjective uk /eəˈrəʊ.bɪk/ us /erˈoʊ.bɪk/

aerobic exercise

(Definition of “aerobics” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“aerobics” in American English

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aerobicsnoun [ U ]

us /eəˈroʊ·bɪks/

energetic physical exercises that make the heart, lungs, and muscles stronger and increase the amount of oxygen in the blood:

I do aerobics and weight training at the gym.
aerobic
adjective [ not gradable ] us /eəˈroʊ·bɪk/

aerobic exercise

(Definition of “aerobics” from the Cambridge Academic Content Dictionary © Cambridge University Press)